Blueberry plant named &#39;Drisbluesix&#39;

ABSTRACT

A new and distinct variety of blueberry plant named ‘DrisBlueSix’ particularly distinguished by having a very low chilling requirement, very early harvest season with high fruit productivity, and firm, sweet berries with medium acidity, is disclosed.

GENUS AND SPECIES

Vaccinium corymbosum L.

VARIETY DENOMINATION

‘DrisBlueSix’

BACKGROUND OF THE NEW PLANT

The invention relates to a new and distinct blueberry variety designated ‘DrisBlueSix’ and botanically known as Vaccinium corymbosum L. This new blueberry variety was discovered in Santa Cruz, Calif. in June 2001 and originated from a cross between the proprietary female parent blueberry plant ‘MS122’ (unpatented) and the male parent blueberry plant ‘FL166 N’ (unpatented). The original seedling of the new variety was first asexually propagated at a nursery in Monterey, Calif. ‘DrisBlueSix’ was subsequently asexually propagated and underwent further testing at a nursery in Santa Cruz, Calif. for twelve years. The present invention has been found to be stable and reproduce true to type through successive asexual propagations via softwood cuttings.

Plant Breeder's Rights for this variety have not been applied for. ‘DrisBlueSix’ has not been made publicly available or sold more than one year prior to the filing date of this application.

SUMMARY OF THE INVENTION

The following are the most outstanding and distinguishing characteristics of this new cultivar when grown under normal horticultural practices in Santa Cruz, Calif.

1. A very low chilling requirement;

2. Very early harvest season with high fruit productivity; and

3. Firm, sweet berries with medium acidity.

DESCRIPTION OF THE PHOTOGRAPHS

This new blueberry plant is illustrated by the accompanying photographs which show fruit of the plant as well as the flowers and leaves. The colors shown are as true as can be reasonably obtained by conventional photographic procedures. The photographs are of plants that are 11 years old.

FIG. 1 shows a close-up of the mature flowers.

FIG. 2 shows a close-up of the leaves.

FIG. 3 shows a close-up of the whole fruit, with and without bloom, and a cross-section of the fruit.

DESCRIPTION OF THE NEW CULTIVAR

The following detailed description sets forth the distinctive characteristics of ‘DrisBlueSix.’ The data which define these characteristics is based on observations taken in Santa Cruz, Calif. from 2001 to 2012. This description is in accordance with UPOV terminology. Color designations, color descriptions, and other phenotypical descriptions may deviate from the stated values and descriptions depending upon variation in environmental, seasonal, climatic and cultural conditions. ‘DrisBlueSix’ has not been observed under all possible environmental conditions. The botanical description of ‘DrisBlueSix’ was taken from 11 year-old plants. Color references are primarily to the R.H.S. Colour Chart of The Royal Horticultural Society of London (R.H.S.) (2007 edition). Descriptive terminology follows the Plant Identification Terminology, An Illustrated Glossary, 2^(nd) edition by James G. Harris and Melinda Woolf Harris, unless where otherwise defined.

DETAILED BOTANICAL DESCRIPTION

-   Classification:     -   -   Family.—Ericaceae.         -   Botanical.—Vaccinium corymbosum L.         -   Common name.—Blueberry.         -   Variety name.—‘DrisBlueSix’. -   Parentage:     -   -   Female parent.—The proprietary blueberry plant ‘MS122’             (unpatented).         -   Male parent.—The blueberry plant ‘FL166 N’ (unpatented). -   Plant:     -   -   Size.—Large.         -   Height.—190.5 cm.         -   Width.—169.8 cm.         -   Length/width ratio.—1.1.         -   Plant vigor.—Medium to strong.         -   Growth habit.—Semi-erect.         -   Productivity.—High.         -   Cold hardiness.—Medium.         -   Chilling requirement.—Very low; 150-250 chilling hours.         -   Propagation.—Soft wood cuttings.         -   Time of vegetative bud burst.—Early.         -   Fruiting type.—Only on one-year-old shoots.         -   Cane renewal.—Strong.         -   One-year old canes (Young canes).—Length: 109.61 cm Diameter             at the base: 7.06 mm Diameter at the tip: 3.84 mm Texture:             Smooth Color (One-year old shoot, branch and canes): RHS             144B (Medium green).         -   Five-year old canes (Mature canes).—Length: 176.60 cm             Diameter at the base: 21.15 mm Texture: Rough Color: RHS             145A (Light yellow-green). -   Leaves:     -   -   Length.—Medium to long; 7.15 cm.         -   Width.—Medium; 4.17 cm.         -   Length/width ratio.—1.7; longer than broad.         -   Shape.—Elliptic.         -   Apex.—Cuspidate.         -   Base.—Cuneate.         -   Margin.—Entire.         -   Glossiness.—Medium to glossy.         -   Pubescence.—Glabrous (Absent).         -   Sheath.—Absent.         -   Arrangement.—Alternate.         -   Venation.—Reticulate.         -   Color.—Upper surface: Dark; RHS N134A (Dark green) Lower             surface: Medium; RHS N138C (Medium green).         -   Appearance of leaf bud.—Early to medium.         -   Internode length (On-year old shoot, upper half).—Long;             28.76 mm. -   Petiole:     -   -   Length.—5.3 mm.         -   Diameter.—1.36 mm.         -   Color.—RHS 145B (Light yellow-green). -   Flowers:     -   -   Length (Excluding peduncle).—Medium to long; 9.70 mm.         -   Diameter.—6.51 mm.         -   Length/width ratio.—1.5.         -   Color.—RHS 157C (Green-white).         -   Flower bud.—Length: 8.47 mm Width: 2.80 mm Number of flowers             per bud: 5 Color on mature buds: RHS 65C (Light red-purple)             and RHS 155B (White) Anthocyanin coloration: Very weak or             absent; RHS 63A (Medium red-purple.         -   Petal width.—3.69 mm.         -   Fragrance.—Medium.         -   Time of beginning flowering on one-year shoot.—Early.         -   Time of flowering (50% full bloom).—Early; March 10.         -   Pedicel.—Length: 9.00 mm Diameter: 0.67 mm Color: RHS 144C             (Medium yellow-green)         -   Corolla.—Aperture diameter: 3.48 mm Shape: Urceolate Size of             corolla tube: Small Corolla tube color: Very weak or absent;             RHS 63B (Medium red-purple) Ridges on tube: Present.         -   Peduncle length.—6.01 cm. -   Reproductive organs:     -   -   Style length (including stigma).—7.48 mm.         -   Ovary color.—RHS 191B (Medium greyed-green).         -   Pollen amount.—Low to medium.         -   Pollen color.—RHS 4D (Light yellow).         -   Anther color.—RHS N167A (Medium greyed-orange). -   Fruit:     -   -   Size.—Medium to large.         -   Length.—14.60 mm.         -   Width.—19.62 mm.         -   Length/width ratio.—0.7.         -   Fruit pedicel diameter.—1.32 mm.         -   Weight.—3.2 g.         -   Number of berries per cluster.—6.         -   Cluster density.—Medium.         -   Shape in longitudinal sections.—Oblate.         -   Intensity of green color (Immature fruit with bloom).—Light             or clear; RHS 142D (Light green).         -   Color of skin (Mature fruit without bloom).—RHS 103A (Dark             blue).         -   Color of skin (Mature fruit with bloom).—RHS 98D (Medium             violet-blue).         -   Intensity of bloom (Mature fruit).—Strong.         -   Attitude of sepals.—Incurving.         -   Calyx.—Diameter of basin: Medium; 8.91 mm Depth of basin:             Medium; 4.17 mm Diameter/depth ratio: 2.1.         -   Flesh color.—RHS 142D (Light green).         -   Firmness.—Firm.         -   Sweetness.—Medium.         -   Acidity.—Medium.         -   Time of beginning of fruit ripening (One-year old             shoots).—Very early.         -   Harvest season.—Very early.         -   Harvest interval.—May 15 to October 15. -   Seeds:     -   -   Length.—1.69 mm.         -   Width.—1.02 mm.         -   Length/width ratio.—1.7.         -   Abundance.—Low to medium.         -   Color.—RHS 166B (Medium greyed-orange). -   Resistance to pests and diseases: Data not available.

COMPARISON WITH COMMERCIAL VARIETIES

‘DrisBlueSix’ differs from the commercial variety ‘DrisBlueOne’ (U.S. Plant Pat. No. 20,449) in that ‘DrisBlueSix’ has leaves with a cuspidate apex and firm, oblate shaped berries, whereas ‘DrisBlueOne’ has leaves with a broadly acute apex and very firm, slightly oblate sphere shaped berries. Additionally, ‘DrisBlueSix’ has a very low chilling requirement, whereas ‘DrisBlueOne’ has a medium chilling requirement.

‘DrisBlueSix’ differs from the commercial variety ‘DrisBlueTwo’ (U.S. Plant Pat. No. 20,488), in that ‘DrisBlueSix’ has leaves with an cuneate base and an entire margin, whereas ‘DrisBlueTwo’ has leaves with a broadly acute base and a serrulate margin. Additionally, ‘DrisBlueSix’ has oblate shaped berries with a strong bloom intensity on mature fruit, whereas ‘DrisBlueTwo’ has nearly spherical shaped berries with weak bloom intensity on mature fruit. 

1. A new and distinct variety of blueberry plant named ‘DrisBlueSix’ as shown and described herein. 